(2) Put the access platform in position.
 Subtask 78-31-49-040-113

 C. Make the thrust reverser unserviceable (Ref. TASK 78-30-00-481-041)
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 (Ref. Fig. 413/TASK 78-31-49-991-314) Subtask 78-31-49-020-085
 A. Removal of the Upper Head Supply Hose
 (1) Put a container 1 USgal (4 L) under the lower hydraulic actuator.

 (2) Disconnect the lower head supply hose from the actuator and let the hydraulic fluid drain into the container.

 (3) Connect the lower rod supply hose to the actuator.

 (4) TORQUE the coupling nut to between 235 and 260 lbf.in (2.65 and 2.93 m.daN).

 NOTE : Apply a witness line of finish paint EA4 blue 5991 (Material
____ No. CP2245) on the nut and connection after they are torqued.
 (5) Loosen the bottom bolt that attach the upper half clamp to the middle hydraulic line bracket. Remove the top bolt.

 (6) Remove the upper head shield from the middle hydraulic line bracket.

 (7) Disconnect the upper head supply hose from the swivel joint and the upper hydraulic actuator.

 (8) Remove the upper head supply hose from the forward frame.

 (9) Put protective covers on the hose ends.

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 Upper Head Supply Hose
 Figure 413/TASK 78-31-49-991-314

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 TASK 78-31-49-400-027

 Installation of the Upper Head Supply Hose
 WARNING : WEAR A FACE SHIELD WHICH IS RESISTANT TO HIGH PRESSURE JETS WHEN YOU
_______
 WORK ON PRESSURIZED SYSTEMS.

R WARNING : DO NOT GET THE FLUID ON YOUR SKIN OR IN YOUR EYES. IF YOU DO:
_______ R - FLUSH IT AWAY WITH CLEAN WATER R - GET MEDICAL AID.
 CAUTION : USE 2 WRENCHES TO REMOVE OR INSTALL THE TUBE COUPLING NUTS.
_______
 ONE WRENCH TO HOLD THE UNION AND ONE TO LOOSEN OR TIGHTEN THE
 COUPLING NUT. THIS WILL PREVENT DAMAGE TO THE HARDWARE.

 CAUTION : MAKE SURE THERE IS NO UNWANTED MATERIAL IN THE PORTS AND ORIFICES OR
_______
 DAMAGE CAN OCCUR.

 CAUTION : YOU MUST INSTALL HYDRAULIC TUBES WITH HYDRAULIC FLUID AS LUBRICANT.
_______
 1. Reason for the Job
__________________
 Self Explanatory
 2. Job Set-up Information
______________________
 A. Fixtures, Tools, Test and Support Equipment
 -------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific  warning notice
 No specific access platform 1 m (3 ft. 3 in.) R No specific Torque Wrench : range 5.00 to 35.00 lbf.in R (0.05 to 0.40 m.daN)
 No specific  Torque Wrench : range 96.00 to 900.00 lbf.in
 (1.00 to 10.00 m.daN)
 B. Consumable Materials
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
Material No. CP2245  *
 finish paint EA4 blue 5991 (Ref. 70-30-00)

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 C. Referenced Information

 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
71-13-00-010-040 Opening of the Fan Cowl Doors 71-13-00-410-040 Closing of the Fan Cowl Doors 78-30-00-081-041 Make the Thrust Reverser Serviceable after
 Maintenance 78-30-00-481-041 Make the Thrust Reverser Unserviceable for
 Maintenance 78-30-00-710-040 Thrust Reverser Hydraulic System Bleed Procedure 78-31-49-991-314 Fig. 413
 3. Job Set-up
__________
 Subtask 78-31-49-860-093
 A. Aircraft Maintenance Configuration
 (1) On the center pedestal, on the ENG panel 115VU, make sure that a warning notice is in position to tell persons not to start the engine.
　
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